Abstract
Steel corrosion is considered as the main factor for the insufficient durability of concrete structures, especially in the marine environment. In this paper, to further inhibit steel corrosion in a high chloride environment and take advantage of the dual-functional carbon fiber reinforced polymer (CFRP), the impressed current cathodic protection (ICCP) technique was applied to the hybrid-reinforced concrete beam with internally embedded CFRP bars and steel fiber reinforced polymer composite bar (SFCB) as the anode material while the steel bar was compelled to the cathode. The effect of the new ICCP system on the flexural performance of the hybrid-reinforced concrete beam subjected to corrosion was verified experimentally. First, the electricity-accelerated precorrosion test was performed for the steel bar in the hybrid-reinforced beams with a target corrosion ratio of 5%. Then, the dry–wet cycles corrosion was conducted and the ICCP system was activated simultaneously for the hybrid-reinforced concrete beam for 180 days. Finally, the three-point bending experiment was carried out for the hybrid-reinforced concrete beams. The steel bars were taken out from the concrete to quantitatively measure the corrosion ratio after flexural tests. Results showed that the further corrosion of steel bars could be inhibited effectively by the ICCP treatment with the CFRP bar and the SFCB as the anode. Additionally, the ICCP system showed an obvious effect on the flexural behavior of the hybrid-reinforced concrete beams: The crack load and ultimate load, as well as the stiffness, were enhanced notably compared with the beam without ICCP treatment. Compared with the SFCB anode, the ICCP system with the CFRP bar as the anode material was more effective for the hybrid-reinforced concrete beam to prevent the steel corrosion.
Highlights
In civil engineering, steel corrosion is considered as the main factor for the insufficient durability of concrete structures [1,2]
Compared with the line density loss for carbon fiber reinforced polymer (CFRP)-UP, the value was evaluated as 4.22% for CFRP-CP, indicating that the impressed current cathodic protection (ICCP) treatment was effective with CFRP bars as the anode and the corrosion process of steel bars was inhibited in the severe environment
To further inhibit steel corrosion in a high chloride environment and take advantage of the dual-functional CFRP, the ICCP technique was applied to the hybrid-reinforced concrete beam with internally embedded CFRP bars and steel fiber reinforced polymer composite bar (SFCB) as the anode material
Summary
Steel corrosion is considered as the main factor for the insufficient durability of concrete structures [1,2]. To ensure the bonding reliability between the externally bonded CFRP and the concrete, as well as to improve the reinforcing effectiveness of the CFRP, developing an efficient conductive inorganic binder is urgent, which restricts the application of this system The effect of the new ICCP system on the flexural performance of the hybrid-reinforced concrete beam subjected to corrosion was verified experimentally. TsFheuearwtnhaeetwermr IuoCtriCel,iPzceodsnysasintdedemrdinrigys–tawheeptsreocaymcsialsenincdogarnrmodseistohenaowdpaettroeforprumrtoieltidezceitdntathhneidssdetxeryepl–ewrbimaertecnsyutc,bliejteccotaerndrobsteiooinnthfpeeerrrmefodarmrthineaedt etihnnevtihrnioesnwemxpeICnerCti,mPanesdnytsc,taietnmcfaunirstbhaeeripnprfreoormrmeidsoitntehgtahtmetheutethinloiezdwattioIoCnpCorPof tsseeycasttsetamhnedissatanedpelrsoebmawrisaisntuegbrjmiencetctehidvoidltoetnotghpienroemteeracintrigtnh.ee esnteveilrobnarmseunbtj,eacnteddctaonthfuermthaerrinperoemnvoirteonthmeeuntti,laiznadticoannoffusrethaesrapnrdomanodtesethaewuattielrizianticoinviol fesnegainseaenrdinagn.d seawater in civil engineering
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